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The Company and Significant Accounting Policies - Summary of Amortized Cost and Unrealized Gains (Losses) of Available for Sale Securities (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Certificates of Deposit  
Amortized Cost  
Due within a year $ 2,400
Due after one year through five years 5,882
Total 8,282
Unrealized gains (losses)  
Due within a year (5)
Due after one year through five years (53)
Total (58)
Corporate Bonds  
Amortized Cost  
Due within a year 25,118
Due after one year through five years 100,528
Total 125,646
Unrealized gains (losses)  
Due within a year (67)
Due after one year through five years (1,393)
Total $ (1,460)